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Just hook this Alarm Phone Dialer up to something you would like to monitor, for example, a high water alarm, low temperature alarm, back window, garage door, etc. When the system is activated it will call a number of programmed numbers to let you know the alarm has been activated. This would be great to get alerts of alarm conditions from your home when you are at work. The microcontroller code is provided on the site. The circuit uses a MT8880 DTMF dialer chip and a PIC 16F84A microcontroller. After programming just supply power to the device. After pressing the button “Pokreni dojavu alarma” it will start to dial (tone or pulse, depending on the jumper setup). When the phone call is successfully established, the called party should press pound key “#” to stop the device from calling another number or again. You should put a sensor instead of button “Pokreni dojavu alarma”. Programming the numbers 1. press the “program” button Please note: The device will learn 64 characters/digits including * and # keys.”
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March 28th, 2007
A “real” burglar would cut the phone line (and prolly the power too) before entering the house.. Pretty weak.. :p
March 28th, 2007
Hi Dave,
It would be no better that a modern alarm system, most alarm system still use dialers that use conventional phone lines to call out. It is usually quite expensive to get a cell backup installed. Power could easily be taken off a battery backed up source.
March 28th, 2007
Doesn’t seem like the picture matches the PCB.
March 28th, 2007
Actually Alan, in the United States, a lot of companies will install cellular modules at your request….you can just tell them that you have no home phone service.
Steve, The two look dead on to me.
This looks like it might also be kind of cool to add to a radio repeater to give it autopatch capability!
March 28th, 2007
Dave,
If you’d read the documentation you’d of seen that he was suggesting that this was for home automation and monitoring. The examples he gave were for high water in the basement and low temperature type alarms, not burglar alarms. I wouldn’t call it “weak”.
As for dialers that use Cell, I JUST got a bid from an alarm company who would do a Cell based portable alarm system for about $1500 plus $40/mo to monitor it so that while my partner is flipping houses we can keep security on them. That was a whole lot cheaper then I was going to be able to build one for so… yeah, those are available too.
March 28th, 2007
If you don’t like fixed-phone line you can use this project that uses GSM phone to alert an alarm
http://www.elektronika.ba/projekti/?akc=daj_projekt&idprojekt=5
March 28th, 2007
Phone alarm dialer
Alan writes - Just hook this Alarm Phone Dialer up to something you would like to monitor, for example, a high water alarm, low temperature alarm, back window, garage door, etc. When the system is activated it will call…
March 29th, 2007
[…] Alan writes - Just hook this Alarm Phone Dialer up to something you would like to monitor, for example, a high water alarm, low temperature alarm, back window, garage door, etc. When the system is activated it will call a number of programmed numbers to let you know the alarm has been activated. This would be great to get alerts of alarm conditions from your home when you are at work. The microcontroller code is provided on the site. […]
March 29th, 2007
[…] Alan writes - Just hook this Alarm Phone Dialer up to something you would like to monitor, for example, a high water alarm, low temperature alarm, back window, garage door, etc. When the system is activated it will call a number of programmed numbers to let you know the alarm has been activated. This would be great to get alerts of alarm conditions from your home when you are at work. The microcontroller code is provided on the site. […]
April 10th, 2007
Wow, this would really be quite usefull for a summer house or a property that you dont spend alot of time at.
April 23rd, 2007
I’m confused by this site and this post. I want 1 of these alarms to monitor temperature
on a cooler and freezer. How can I buy one?
May 8th, 2007
Were can I purchase one of these!! I am in dire need of one ASAP!!!!
May 8th, 2007
If you want one you have to build it.
Click on the link in the article for full construction details.
May 11th, 2007
i need the asm code. i am reading the MT8880’s datasheet for settting. i don’t understand why the pin CS(chip select) is connect to ground.???
i’m probe the circuit step by step and i need generate dtmf tones but i can do it
excuse for my bad english
June 4th, 2007
CS is grounded because that’s the only chip on the 8-bit bus! It’s something like: “enable MT8880 allways”.
June 17th, 2007
necesito el asm porque si no no puedo probarlo y grabar el pic muchas gracias
June 18th, 2007
Hello,
It’s really cool to me, but it would be great if you can have voice messages included, also busy tone detection & redial.
Thanks,
Hasen
July 27th, 2007
It has redial, it is dialing over and over until you answer and press the # pound key.
October 2nd, 2007
We have wireles radio with motion sensor to communicate with dialer. We want to add cheaper dialer and fasten sensor with radio by magnetic strip on tractors, tool boxes, back-hoe, etc. When it moves we want to make 3 phone calls. Needs to be cheap so construction firms can put one on all expensive equipment.
Radio has range 1000′ and be extended by repeater. Wireless FCC approved this year and managed bysoftwarel
October 2nd, 2007
Hi Allan, Farm Alarm looks like an interesting product. There are a few dead links on your page though. FAQ for example.
October 8th, 2007
Hi Allan, Can you please give a full component list? I am not able to get the value of the
component used very next to the phone jack (blue colour). Pl. help me with this. Do I
have to connect a Switch above the LED? Please explain the connections on the same…. The PCB
has got two transistors and the schematic has only one… that is why this confusion. Explain
on the connection for “Program mode” and “Trigger mode”.. Thanks. Shiva
November 6th, 2007
What’s the price, and how can i order this kit (Alarm Phone Dialer - uses MT8880 and PIC 16F84A).
November 7th, 2007
how can i buy this alarm
November 9th, 2007
Hi Shiva,
Blue color capacitor you can find in any normal phone, it will be used same way in this circuit.
i think its not a transistor near the phone jack its a part of the transformer.
November 9th, 2007
Hi shiva,
sorry black color is not a part of the transformer
November 9th, 2007
A professional burglar would not only cut the land line he/she also would employ a cellphone detector and jammer which are very simple devices.
Though this or a cell based dialer might catch some random crack head breaking into your house looking for something to hock for quick cash of course they could likely be gone by the time security and police arrive.
Lastly do not have an alarm directly dial 911 as you can get in trouble for prank calling 911 if you get several false alarms.
November 9th, 2007
Another use for this circuit might be to have it monitor something like a battery bank on a solar/wind setup and if the volatge drops too low or goes to high it calls your cell phone.
Or mod it to run off 12v and communicate with a cellphone or phone module and use it as a silent car alarm that calls you if your car is broken into.
December 9th, 2007
Hi,
I would really appreciate if it is possible to have C source code for the pic84
Thanks,
Naeem
December 9th, 2007
Hi Naeem,
Click on the project link to take you to the project site with the downloads.
January 6th, 2008
It’s taken me a while but I have finally found a
place to purchase the MT8880-dip chips. They are
discontinued by the man. and I can get about 50
of them. If you want one drop me a line or email
address.
January 11th, 2008
Some of you people really don’t listen, do you? Or maybe you can’t read. Alan says this is for monitoring things around the house (like high water levels, door open ,etc). He never said it was a burgler alarm. For its intended purpose, it’s a great little device. If you want a burgler alarm, pay some alarm company the big bucks for one. But please remember, the “professional” systems are flakey, too. My neighbor has a very expensive professionally monitored system, and it false alarms at least twice a year.
February 6th, 2008
where are you list of components?
February 6th, 2008
Should be here
http://www.elektronika.ba/projekti/?akc=daj_projekt&idprojekt=7
February 8th, 2008
i opened the website you gave but i can’t find any list of components. I need the specific components from the minor to the major one. Thanks so much
February 10th, 2008
I think they are in the download file. If not email the creator from his page and I am sure he will help you out.
February 13th, 2008
i am very interested in this project and it simply represent a part of my graduation project so i will be glade if you sent me the source file of the code knowing that i disassembled it but it was not clear to understand
so please send it to me to my email(zaidaliali@yahoo.com)and i will be thankful ther is no time for my proposal
February 13th, 2008
Hi zaidali,
Great grad project. You will have to contact the creator directly though, click on the link in the article.
February 14th, 2008
this website offers the advantege of disassmbling the hex file of this project
it was helpful for me i hope it will be useful for you
thanks alot for your help
February 21st, 2008
I’ve been hoping i could get more sources and tge components of this dialer brcause this is my final project. tnx
March 10th, 2008
thanx zaidali for the disassembler
March 15th, 2008
hi, my friends and i are planning to make a phone alarm for our project and we’d appreciate it if you could send us the source code. my e-mail id is GKSville@gmail.com. i’d be so so so very grateful if you could send it to me
March 23rd, 2008
please any body could tell where can i buy the mt8880
thanks
March 23rd, 2008
I have some of the chips if you want one
you can email me at bcideinc AT yahoo DOT com
March 26th, 2008
Please Alan said that is a link to the creator but I cant find it
please I need a material list and the cod for it
please anybody email me
importeusa@hotmail.com
thanks
March 26th, 2008
It is linked in the article, this is the link:
http://www.elektronika.ba/projekti/?akc=daj_projekt&idprojekt=7
April 1st, 2008
please alan could you help me ?
the board doesn’t macht to the esquematic so I can’t came out with an idea about the material list
I can’t figure out What kind of capacitors are those all of then
and it show 1 bc547 but the board show some smd and there is nothing in the squematic about these smd transistors
and the ZD 1v what is thas ?is a diode zener ?
please
thanks
importeusa@hotmail.com
April 1st, 2008
I need better spec for this transformer what is it ?
thanks
April 8th, 2008
It is a transformer from an old PC telephone modem. 600ohm resistance, 1:1.
April 16th, 2008
hi every one
doest anybody know what do i do to the pic pin #4
becouse the squematic says to vcc but the board show a resistor on it but no where say the resistor valuer
April 17th, 2008
what’s the zd 1v component? there is no 1V zener diode available, but the configuration in the circuit is similar to a zener. all the same, i have no idea wat it is. could someone help me?
April 18th, 2008
>what’s the zd 1v component? there is no 1V
>zener diode available,
I think it is supposed to be 5.1v zener diode judging
from other circuits I’ve found.
>hi every one doest anybody know what do i do to the
>pic pin #4
Look for other pic chip wiring and use what ever
they use. I believe but not positive from my old days
working with the pic chip it was 5v connect no resistor.